Improvement in safety-valyes foe steam geneeatoes



C. MASON. vSMETY VALVE EUR STEAM GENERATORS.

No. 65,409, Patented Julie 4, 1867.

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@attrib tats stwt @ffice CARLILE MASCN, OF CHICAGO, ILLINOIS.' Letters Patent No. 65,409, dated Teme 4, 1867.

IMPROVEMENT IN SAFETY-.VALVES FOR STEAM GENERATORS.

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TO ALL WI-IOMr IT MAY CONCERN:

Be it known that I, CARLILE MASON, of the city of Chicago, in the county of Cook, and State of Illinois, have invented certain new and useful Improvements in Safety-Valves; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure I is a longitudinal vertical section.

Figure 2, a top view; and

Figure 3, a vertical section ot' the weight-supporter.

The nature of my invention consists in providing a safety-valve with an additional lever, so connected with or attached to the valve proper, that whenever', by any motion or jar,*the weight is deranged or lifted, such wcight, or so much of the pressure thereof as is taken from the main lever, will be immediately received by the additional lever, and by it be transmitted to the valve, so that the pressure upon the valve will remain the same, or nearly the same, however much the weight may be disturbed; in providing the weight-supporter with spring andcatches, so arranged that the spring will balance the weight; in providing such supporter with catches, so arranged that'whenv the weight rests upon the spring, the main lever can be elevated or depressed without being interfered with in its operations by the additional lever, and in the several combinations hereinafter set forth and claimed, the object being to so constructa safety-valve for marine purposes., locomotives, and other movable engines, that whenever a motion is given which ateets or disturbs the weight independently, or in a measure independent from the main lever, the force or portion of the weight so disturbed and taken from the main lever will react upon an additional lever so located as to bear upon the valve in the same direction asl the main lever, and thereby keep the pres-sure upon the valve uniform; and also so that whenever any motion or jar which affects them all similarly, or whenever the valve is lifted by pressure from the steam, the additional lever will not interfere with the .operation ofthe main lever or the valve.

To enable others skilled in the art to make and use my invention, I will proceed to describe its .construction and operation.

The valve-cylinder or chest A, with thmcvalve a, valve-seat and lever B, are constructed in any of thc known forms, and are of the usual sizes and material. lhc weight F is attached and suspended by a weight-supporter, constructed substantially as shown at figs. l and 3, the lower portion D being a cylinder provided. with a hook at the lower end and open at the upper. Into the upper end I insert the part E, which has about one-half -of the length of its largest diameter fitted to the interior diameter of the cylinder D, and is provided with an extension or rod, t, which is bevelled at its lower endso as to fit the notches or catches of the lever B. Around this bar or rod I place the spring 7c, which spring at its upper end presses against the rods j, which pass around the bar 1i, and are attached to or pass through the cylinder D, and at its lower end rests upon or presses against the plate Z, ,which plate or projection is attached to the rod h nea-r its lower end. The elasticity of this spring will be adjusted so as to balance the weight F. Near the upper end ofthe part E, I insert into a cavity or slot prepared for that purpose, the catches t', which arc hinged r pivoted at m, and so out away at n as to pr'esent a square shoulder when elevated sofas to strike the lever-C. Inv length, they should -not project beyond the cylinder D when resting at their lowest point. The lever C, in the'form shown, is forked so far as it extends over the portion of B, which is provided with catches or stops, and may be brought together at the outer end, as shown, or left open, as shall be desired. The prongs or arms of the fork are spread sniciently to receive thc weight-supporter between them; but I do not conline myself to any particular form or location of this additional lever, as, with a slight change ofthe supporter, it may be made of a single bar, either straight or bent, and, by a slight modification of the weight-supporter, may be placed below the main lever, and, with the necessary changes of the pivotal points, be made to operate successfully. This lever C is pivoted to the valvecylinder on the side opposite to the pivotf of the lever B, as shown at g, and is extended into the cylinder A a little more than halt' of its diameter. To its inner end, at the centre of the cylinder A, I attach two rods or bars e, which extend Gown to the lever B, and are pivoted to it at d, as shown in fig. I, or may be made to bear directly upon the valve-stem I), or the valve a; but when the lever C is located above the lever B, I prefer the connection of these rods c as shown. The weight F may be made in any of the usual forms, and attached to the cylinder D Fri" n any convenient manner. The slots G, for the passage oi' the lever B through the cylinder D, will usually be made in length about `twice the width of the leve-r.v As valves are made of many szes,'no definite sizes or proportions will be necessary in this deseription,'as they will readily suggest themselves to those skilled in their construction.

In operation, whenever the weight is lifted by the pressureof the steam, the additional lever does not affect or interfere with the movement ot' the main lever, as the lifting force is communicated to the weight-supporter through the rod z, so that catches t' are not projected or disturbed. When the weight is disturbed by any rolling or other motion, or by any sudden jar, if not too severe or prolonged, the reaction oi' the spring-it being so gauged as to 'oounterbalance the weight-will keep the pressure uniform upon the main lever and if it is severe or prolonged, then the spring will cause the cylinder to rise upon the head E, so as to project the catches z' under the additional lever C, and the proportion of the weight which is relieved from its direct operation upon the main lever will be transmitted by the spring to the additional lever, and thereby keep the pressure upon the valve uniform, so that by means of the spring7 whatever the motion of weight may be, its force will be exerted upon one or both of the levers, and be adjustedbetween them, so as to produce, t'orall practical proposes, a uniform pressure upon the valve. Y

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The lever C, arranged substantially as and for the purposes specified.

.2. The weight-supporter D E, provided with a spring, k, substantially as specified.

3. The eat-ches z', when so constructed or attached as to remain in position when the weight is elevated by the main lever, and to project when the weight is elevated from any external disturbance, substantially as specified. Y

4. The arrangement of the spring k, with the lever C, or their equivalents, so as to prevent the escape of steam whenever the weight is agitated from any cause, suoli arrangement being Asubstantially as specied.

5. The combination of the lever C and spring with the lever B and weight F, substantially as specified.

G. The combination of the lever G, rod or rods c, and lever B, with the valve a substantially as specified.

7. The combination of the cylinder D, cap E, with the spring c and rod L, substantially as set forth.

8. The combination of the weight-supporter D E, provided with a spring, k, and catches z','lever C, and rod e, with the lever B, cylinder A, valve a, and weight F, substantially as and for the purposes specified.

CARLILE MASON.

Witnesses :v

E. Af WEST, J. I-I. McCAUsLAND. 

